Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va trien » va truyen, va thiet, va tuyen
te sach » toc sach
tang xa » trang xa, tang ma, lang xa
van cam » van nam, van lam, van cau
thuc va » thuc vat, thuc dan, thuc day
dinh ke » dinh ket, dinh ve, dinh le
y tang » ky tang, 6 tang, 7 tang
xuc va » duc va, tuc va, luc va
ke va » te va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y tang xa hoi. hieu van cam ((xuc va) or (thuc va)) dinh ke va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y tang xa hoi. hieu van cam ((xuc va) OR (thuc va)) dinh ke va trien.
• Adding a wildcard symbol may retrieve word variants: te sach y tang xa hoi. hieu van cam ((xuc va) or (thuc va)) dinh ke va trien*.